The invention relates to a turbocharger (1) having variable turbine geometry (VTG) having a turbine housing (2) with a supply duct (9) for exhaust gases; having a turbine rotor (4) which is rotatably mounted in the turbine housing (2); and having a guide grate (18) which surrounds the turbine rotor (4) radially at the outside, which guide grate (18) has a blade mounting ring (6) which has a plurality of guide blades (7) which in each case have a blade shaft (8) mounted in the blade mounting ring (6), which guide grate (18) has an adjusting ring (5) which is operatively connected to the guide blades (7) by means of associated blade levers (20) which are fastened to the blade shafts (8) at one of their ends, wherein each blade lever (20) has, at the other end, a lever head (23) which can be placed in engagement with an associated engagement recess (24) of the adjusting ring (5), and which guide grate (18) has a stop (25) at least for setting the minimum throughflow through the nozzle cross sections which are formed by the guide blades (7), wherein the stop (25) is embodied as a separate component which can be fixed in the guide grate (18).
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5. A guide vane cascade for a turbocharger with variable turbine geometry (VTG), which encloses a turbine rotor of the turbocharger radially on the outside, comprising:
a vane bearing ring,
a multiplicity of guide vanes, each of which has a vane shaft which is mounted in the vane bearing ring,
an adjusting ring which is in functional communication with the guide vanes via associated vane levers which are fastened by one of their ends on the vane shafts (8), wherein each vane lever on the other end has a lever head which can be brought into engagement with an associated engagement recess of the adjusting ring, the adjusting ring having an outer peripheral surface, a front face and an end face, the front face facing the vane bearing ring, the end face being opposite the front face and facing away from the vane bearing ring, and
a stop at least for adjustment of the minimum throughflow between adjacent guide vanes, the stop having an inner end and an outer end, the inner end facing an axis of rotation of the turbine rotor, the outer end being opposite the inner end and facing away from the axis of rotation of the turbine rotor, the stop having a stop body and a projection extending radially outwardly from the stop body,
wherein the stop is formed as a separate component which can be fixed in the guide vane cascade and wherein the stop is fixed against rotation on the vane bearing ring and wherein a portion of the projection engages in a slot of the adjusting ring, and wherein at least a substantial portion of the stop body, the projection and the lever heads are located on the end face side of the adjusting ring.
1. A turbocharger with variable turbine geometry (VTG) comprising:
a turbine housing with a feed passage for exhaust gases;
a turbine rotor, which is rotatably mounted in the turbine housing; and
a guide vane cascade,
which encloses the turbine rotor radially on the outside,
which has a vane bearing ring,
which has a multiplicity of guide vanes, each of which has a vane shaft which is mounted in the vane bearing ring,
which has an adjusting ring which is in functional communication with the guide vanes via associated vane levers which are fastened by one of their ends on the vane shafts, wherein each vane lever on the other end has a lever head which can be brought into engagement with an associated engagement recess of the adjusting ring, the adjusting ring having an outer peripheral surface, a front face and an end face, the front face facing the vane bearing ring, the end face being opposite the front face and facing away from the vane bearing ring, and
which has a stop at least for adjustment of the minimum throughflow between adjacent guide vanes, the stop having an inner end and an outer end, the inner end facing an axis of rotation of the turbine rotor, the outer end being opposite the inner end and facing away from the axis of rotation of the turbine rotor, the stop having a stop body and a projection extending radially outwardly from the stop body,
wherein the stop is formed as a separate component which can be fixed in the guide vane cascade and
wherein the stop is fixed against rotation on the vane bearing ring and wherein a portion of the projection engages in a slot of the adjusting ring, and wherein at least a substantial portion of the stop body, the projection and the lever heads are located on the end face side of the adjusting ring.
3. The turbocharger as claimed in
4. The turbocharger as claimed in
6. The turbocharger as claimed in
7. The turbocharger as claimed in
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The invention relates to a turbocharger according to the preamble of claim 1.
Such a turbocharger is known from EP 1 564 380 A1. For avoiding a weakening of the adjusting ring, this publication proposes a stop which is connected in one piece to the adjusting ring.
As a result of the one-piece formation of the stop on the adjusting ring it is possible, however, in the case of the known turbocharger to aftermachine the projection of the stop after installation of the guide vane cascade only at relatively high cost, if at all, if for example a correction of the end positions of the guide vane cascade ought to be undertaken or has to be undertaken. Furthermore, the projection of the stop of the known turbocharger limits the end positions as a result of abutment on fastening rings of the adjusting levers on the vanes which also makes an accurate adjustment of the end positions more difficult, since for one thing the fastening rings of these vane adjusting levers are subjected to manufacturing tolerances and for another inaccuracies arise as a result of the positioning (spacing).
It is therefore an object of the present invention to create a turbocharger of a type which is disclosed in the preamble of claim 1 which enables a simplification of the installation of the guide vane cascade or of the diffuser, wherein at least one simple and accurate adjustment of the minimum throughflow is to be possible by means of the diffuser alone.
The achieving of this object is effected by means of the features of claim 1.
By the fact that the stop, by which at least an adjustment of the minimum throughflow through the nozzle cross sections which are formed by the guide vanes is possible, is formed as a separate component which can be fixed in the guide vane cascade, it is possible after installation of the guide vane cascade to aftermachine this stop in a simple mariner for precise adjustment of the required stop position, since it is not connected in one piece to the guide vane cascade. If the necessity arises of a readjustment of one of the two end positions of the guide vane cascade, either a stop component which is suitable for the desired end position can therefore be selected and installed in a simple way, or the stop component which is provided can be adjusted by aftermachining of the projection and then installed in the guide vane cascade. Therefore, it is possible to undertake an accurate end position setting in a purposeful manner which in the case of the generic-type turbocharger is problematical on account of the one-piece formation of the stop.
In principle it is possible to fix the stop both on the bearing ring which is fixed in the housing, or on the movable adjusting ring. Depending upon this the projection of the stop then interacts either with mating stop surfaces of the adjusting ring or with the fastening rings of the vane levers.
Furthermore, the advantage arises that the entire diffuser can be completely preassembled as a cartridge and the minimum throughflow adjusted before it is then installed in the turbine housing.
The adjustment of the minimum throughflow is therefore carried out independently of turbine housing and other components of the turbocharger, such as the bearing housing. Also, the duct position between bearing housing and turbine housing no longer has any influence on the minimum throughflow adjustment. Similarly wear of the adjusting lever and its action upon the adjusting ring does not have any effect upon the minimum throughflow volume.
It is furthermore conceivable, in the case of welding, to directly connect the vane shafts to the vane levers in the position which is required for the minimum flow adjustment and consequently to dispense with a subsequent adjusting process. In this way, the risk and the possibility of a minimum flow change is excluded.
The dependent claims have advantageous developments of the invention as subject matter.
In claim 8, a guide vane cascade is defined as an object which can be treated independently in each case.
Further details, advantages and features of the invention result from the subsequent description of an exemplary embodiment with reference to the drawing. In the drawing:
In
In order to control the movement or the position of the guide vanes 7, an operating device 11 is provided. This can be optionally formed per se, but a preferred embodiment features a control housing 12 which controls the control movement of a ram component 14 which is fastened to it, in order to convert its movement onto an adjusting ring 5, which is located behind the vane bearing ring 6, into a free rotational movement of the adjusting ring. A free space 13 for the guide vanes 7 is formed between the vane bearing ring 6 and an annular section 15 of the turbine housing 2. In order to be able to safeguard this free space 13, the vane bearing ring 6 has spacers 16 which are formed in one piece. In the exemplary case, three spacers 16 are arranged on the circumference of the vane bearing ring 6 with an angular spacing of 120° in each case. In principle, however, it is possible to provide such spacers 16 in a greater or lesser number.
In
A vane lever 20 is shown which is representative for all the vane levers of this guide vane cascade 18 and which at one end has a fastening ring 21 with an opening 22 in which one end of the vane shaft 8 is fixed.
A lever head 23 of the vane lever 20 is arranged in an engagement recess 24 of the adjusting ring 5 and is therefore in engagement with the adjusting ring 5.
Furthermore,
As
In
As opposed to the addition of a stop bridge 28, the stop 25 of the second embodiment is provided with an adjustment plate 32. The adjustment plate 32 has a fixing plate 35 which can be fastened on the stop body 26, such as by means of a fixing clip 36. Naturally, any other types of fastening possibilities for the adjustment plate 32 on the stop body 26 are also conceivable.
Instead of the stop bridge 28, in the case of the second embodiment the adjustment plate 32 is provided with a stop plate 33 which extends parallel to the side face 34 of the projection 27 and occupies a distance to this, which is apparent from
By means of this embodiment, the stop position can consequently be achieved by exchanging the adjustment plate 32 so that an exact adjustment, especially of the minimum throughflow, is also possible in the case of this embodiment in a simple and inexpensive manner.
For supplementing the disclosure, the diagrammatic representation of the invention in
List of Designations
Patent | Priority | Assignee | Title |
8992164, | Nov 27 2009 | BorgWarner Inc | Turbocharger |
8992166, | Nov 27 2009 | BorgWarner Inc | Turbocharger |
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Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
May 16 2007 | Borgwarner Inc. | (assignment on the face of the patent) | / | |||
Dec 16 2008 | METZ, DIETMAR | BorgWarner Inc | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 022187 | /0130 | |
Jan 08 2009 | BOENING, RALF | BorgWarner Inc | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 022187 | /0130 |
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